[time-nuts] May I ask for your advice on a faulty 5370B?

[Dr Bruce Griffiths]

S McNamara wrote:
> G'Day All,
> I just purchased a 2nd hand HP5370B counter.
> It was last calibrated in 2002 but fails the operators checks.
> I have run tests 1-21 and only a few fail.
> In step 13 the display indicates 90.9*ns
> In step 15 the std dev is 20.* to 16.*ns with a min of 90.9*ns and a max 
> of 91.*ns
> In step 17 the stop period is 91.*ns and the start period is 8.91ns
> I have measured its ref output with another counter and it seems stable 
> and 10MHz.
> So I am seeking ideas on where to start to fault find, any guidance 
> would be much appreciated.
> Regards Scott
>
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>   

Check the frequency multiplier chain alignment.

Bruce